Describe the shape of the planarian. was there a difference between the two ends of the planarian?

Planarian is a member of the family Planariidae and is one of the flatworms present on the planet.

These planarian species have bilateral symmetry with a soft, leaf-shaped and ciliated body of 3 to 15 mm length and can grow up to 30 cm.

Its head is spade-shaped with two eyes which help him in running away from light and a brain made of ganglion cells. The mouth is present on the ventral (lower) side of the body towards the tail which is pointed.

Head and tail region of planaria show the difference as the head part contains eye-spots and is broad whereas tail part contains mouth near to it and is pointed.

c. movement because i took the test and it lets me review my answers

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.